Valve tappet and guide



July 15,1930. BROWNBACK VALVE TAPPET AND GUIDE Filed Sept. 8, 1928 INVENTOR. l

Patented July 15, 1930 UNITED STATESIIPATEN T OFFICE.

HENRY LOWE BRowNBAc z, or NoR'RIs'rowN, PENNSYLVANIA VALVE TAPPET AND GUIDE I Application filed September 8, 1928.

I This invention relates to the valve vtappets duct for the fuel vapors leading to the cylinders, using the lower than atmospheric pressureavailable in such duct-to suck the sur plus o l theremto' and while in all such air was simultaneously drawn into the intake duct thereby weakening-or materially interfering with the fuel as mixture through dilution ;-this condition eing particularly apparent at low engine speeds.

'In my invention as set forth-in this application, the principal objectis to entirely obviate the above mentioned difliculty and undesirable condition by the use of suitable oil seals, which while allowing the surplus oil to be drawn into the fuel duct or other aspiration tube at the same timethe oil seals prevent the seepage of air into the intake duct or other aspiration tube, thereby preventing dilution of the fuel gases, -I will explain the invention with reference to the accompanying drawing which illustrates one practical embodiment thereof to enable others familiar with the art to adopt and use the same; and will summarize in the claims the novel features of construction, and novel combinations of'parts, for which pro tection isdesired.

In said drawings Fig. I is an elevation of an internal combustion engine cylinder, showing in section the valve tappets, their guides, and adjacent portions of the engine block.

Fig. 2 is an enlarged detail section show: ing the ducts and oil seals in the tappets and guides, and-the outlet therefrom into the intake duct. a

Fig. 3 is an enlarged exterior view of a tappet. detached.

passing same into the intake are reclprocably ,on the construction is well known and tween the guides 9 and 10 I Serial No. 304,678.

Fig. 4 is an enlarged exteri'or view of a tappet guide, detached.

he engine shown in the drawing is of radial type, having an annular fuel inlet duct connecting the carburetor (not shown) with the several pipes A leading to the inlet ports ofthe ing preferably cast into the crank case C between the tappet housing blockD and the engine cylinder block proper. In block D mounted tappets land 2 operating the rocker-arms 3 and for the inlet and exhaust valves of the cylinengine cylinders B, duct A be der througlradjustable push rods 5 and 6, one

such set of tappets 1 and 2 with their rods and rocker arms being provided for each cylinder. The tappets 1 and 2 may be of any suitable type, having rollers 1, 2 on their of tappets l, 2, are provided the usual sock ets 1", 2 receiving the usual ball heads lower ends of the push rods.

The tappets l and 2'are provided with guides 9-and 10 respectively, preferably of bronze or other material and of tubular shape, the guides being disposed around the tappets and snugly fitting within bores in the block I), and serving-as bushings for said tappets. The lower ends of the guides 9 and 10, are provided with slots as shown at Win Fig. 4 through which the tappet rollers l, 2 project, thereby preventing the tappets from rotating in their guides while permitting reciprocationof said tappets therein. The above described of my present invention.

As shown in Fig. 2, I provide in tappets l and 2, intermediate their ends shallow oil seals consisting of exterior annular grooves 1, 2 of width greater than the working strokes of the tappets. In the guides 9 and 10, I likewise provide shallow oil seals consisting of similar exterior annular grooves, 9-, 10 disposed substantially opposite the grooves 1, 2 in the tappets. Also through the bod of the tappet housing block D beprovide a bore 11, which registers with and is ,in constant communicu'tion with the annular grooves 9, 10

push

forms no partof the guides. opposite the ends of bore I atmospheric pressure.

' oil around the tappets I tween-the tagp a v aspiration 25 P radial anounting of the tappets and guides Furthermore, in guides 9 and 11 are diametrically disposed perforations 9 and;10 whereby the grooves 1 and 2, 9 and 10 will be in constant directcommunication for any position' of the tappets in their guides. In the particular embodiment shown in the drawing, I also provide a vbore 12 extending through the housing D opposite the bore 11 and com- ,municating with the fuel duct A, whereby the rooves'1, 2, 9 and 10 will always be in direct communication with the aspiration point, or fuel duct A, having a lower than If however the fuel duct A should not be cast into the engine casing adjacent the tappet housing D, the bore 12 of housing D may readily be provided with any well known outlet pipe union (not shown) connecting with an aspiration pipe leading directly to the inlet duct of the engine or to any other suitable aspiration point.

In operation: As the engine is started, the of the inlet manifold A creates a artial vacuum in the ducts 1, 2, 9, 10, 9, 10, 11 and 12, and as the surplus'lubricating under the reciprocating action of the tappets land 2 works down bets and guides and block D into the annu r grooves 1, 2, 9, 10 of the tappets and guides, the said, surplus oil is drawn or sucked through the perforations and through ducts 11 and 12 into the aspiration tube suchasthe inlet duct A. In this way the oil around the tappets 1, 2' is spread into thin sheets inthe grooves 1, and provides a perfect air seal as the sheets of oil around the tappets are always over the aspiration holes 11 and 12; and this oil seal -is further safeguarded by the thin sheets of oil in the external grooves 9 and 10 of the guides 9 and 10,which oil seals prevent any air which might escape down the bore for the guides 9, 10 from working into the fuel duct A. After these oil seals in the grooves are once established they will be maintained even when the engine is at rest by the adhesion of the thin sheets of oil to the metal surfaces, and by capillary actionythus sealing the same whenand as the motor is started. This is especially advantageous in radial motors where the upsetting of the quality of the m xture reaching individual cylinders causes internal vibrations and rough running; furthermore the makes them prone tolose o1l.-. v

I do not consider my invention limited to the exact form shown in the drawing for obviously changes may be made therein within the scope of'the claims.

1. In an internal combustion engine having inlet and exhaust valves, and having an aspirating duct maintaining a less-than at mospheric pressure; guides mounted in the to the fuel duct, and

ing inlet and exhaust valves,

tappets reciprocally mounted engine block; mounted in the said guides, around the guides and tappets for collecting surplus lubricating oil and delivering same into the duct, said means preventing the seepage of aid into the duct. v i 2. In an, internal combustion engine having inlet and exhaust valves, and having an aspirating duct maintaining a less-than-atmospheric pressure; tappetguides mounte in the engine cally mounted in the said guides, and means within the block around the guides and tappets for-collecting and delivering surplus lubricating oil into the duct while prevent ing the seepage of air into the said duct. 3. In an internal combustion engine ing inlet and exhaust valves, and-having an aspirating inlet duct delivering fuel vapors at less-than-atmospheric pressure; tappet guides mounted in the engine block; valve tappets reciprocally mounted in the said guides; means within theblo'ck around the means and the fuel duct.

4. In an internal combustion engine having inlet and exhaust valves, and having an aspirating inlet duct delivering fuel vapors at less-than-atmospheric pressure; tappet guides mounted in the engine block; valve tappets reciprocally mounted in the said guides; and oil seals within theblock disosed around the guides and tap ets for 001- ecting and deliverin surplus lu ricating oil or preventing the seepvalve tappets reciiprocally an means block; valve tappets reciprohavv age of air into the fuel duct with the said oil.

5. In an internal combustion engine havand having an aspirating inlet-duct delivering fuel vapors at less-than-atmospheric pressure; tappet guides mounted in the engine block; valve tappets reciprocally mounted in the said guides; and oil seals within the block disposed around the guides and tappetsfor collecting surplus lubricating oil; and means establishing constant communication between the oil seals and the fuel duct whereby seepage of air into the fuel duct will be prevented.

'6. In an internal combustion engine having inlet and exhaust valves, and having an aspirating inlet duct delivering fuel vapors at less-than-atmospheric pressure; tappet guides mounted in the engine block; valve in the said uides; intercommunicating external annuar grooves around the guides and tappets for collectin surpluslubricating oil; and means for con noting the surplus oil from the grooves to the fuel duct; the seepage of air into the fuel duct being prevented by the oil seals formed by said grooves.

7. In an'internal combustion engine having inlet and exhaust valves, and having an tapper guides aspirating inlet ductdeli'vering fuel vapors at less-than-atmospherio pressure; tubular mounted in'the engine block; valve tappets said guides, intercommunicating external annular grooves around the guides and tappet-s for collecting surplus lubricating oil, and. means establishing constant communication etWeen all the grooves and the fuel duct;

the seepage of air into the fuel duct being prevented by the oil seals formed by said grooves.

reciprocally mounted in the HENRY LOWE BROWNBACK. 

